62 lines
1.6 KiB
TypeScript
62 lines
1.6 KiB
TypeScript
import { parse } from '#parser/parser2'
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import type { SyntaxNode } from '#parser/node'
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import { isIdentStart, isIdentChar } from './tokenizer2'
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// Turns a { curly string } into strings and nodes for interpolation
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export const tokenizeCurlyString = (value: string): (string | [string, SyntaxNode])[] => {
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let pos = 1
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let start = 1
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let char = value[pos]
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const tokens: (string | [string, SyntaxNode])[] = []
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while (pos < value.length) {
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if (char === '$') {
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// escaped \$
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if (value[pos - 1] === '\\' && value[pos - 2] !== '\\') {
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tokens.push(value.slice(start, pos - 1))
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start = pos
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char = value[++pos]
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continue
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}
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tokens.push(value.slice(start, pos))
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start = pos
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if (value[pos + 1] === '(') {
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pos++ // slip opening '('
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char = value[++pos]
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if (!char) break
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let depth = 0
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while (char) {
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if (char === '(') depth++
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if (char === ')') depth--
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if (depth < 0) break
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char = value[++pos]
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}
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const input = value.slice(start + 2, pos) // skip '$('
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tokens.push([input, parse(input)])
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start = pos + 1 // start after ')'
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} else {
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char = value[++pos]
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if (!char) break
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if (!isIdentStart(char.charCodeAt(0))) break
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while (char && isIdentChar(char.charCodeAt(0))) char = value[++pos]
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const input = value.slice(start + 1, pos) // skip '$'
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tokens.push([input, parse(input)])
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start = pos-- // backtrack and start over
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}
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}
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char = value[++pos]
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}
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tokens.push(value.slice(start, pos - 1))
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return tokens
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}
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